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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 24, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick Regal Custom 3.1L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 2G4WB54T2M
been trying to solve problem for some time. each time problem is fixed for a week or two. then returns. now each fix last for a shorter amount of time.
1993 Buick Park Avenue 3.8L Poor Idle Quality VIN: 1G4CW53LXP
on start up vehicle idles high.once warmed up and vehicle is driven,upon coming to a stop it will idle down and be okay for the rest of that drive cycle.once it has been shut off and restarted it does it all over again.the idle speed motor has been replaced.an...
2000 Buick Regal LS 3.8L air bag light VIN: 2G4WB55K6Y
Hello everyone. This is a little old lady's car. She purchased it with 9,000 miles and now it only has 25,000 miles. The vehicle sat for a few months recently and she experienced an air bag light with the 2 codes listed above. We thought it was a fluke and cle...
1990 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC14K8L
This truck has me baffled. It was brought in with mil on an code 43 stored. I cleared code and test drove the truck and code 43 came back so I began testing as follows. Performed dtc 43 in manual No knock present at Idle Tapped on engine block...NO knock reg... Trouble codes: 43 (Problem with ESC Module)
1997 Chevrolet Monte Carlo LS 3.1L electric window VIN: 2G1WW12M7V
When the window switch is pressed for auto down window goes down, but will not go back up for a few minutes. If you press the buton to go down a few inches it will go back up with no problems. The window must go all the way down with auto down before problems ...
1995 GMC Yukon SLE 5.7L Surge, Stall VIN: 1GKEC13K4S
Hello fellows Techs,I have this Yukon that is driving me nuts,truck came to the shop for stalling and surging at low speed,fuel pump was reading 11 PSI,new pump installed now reads 14 PSI,ditribuitor removed and pick up coil and module replaced,no change. Scan...
1997 Oldsmobile Aurora 4.0L Cooling Systems VIN: 1G3GR62C4V
When this vehicle came in the customer complaint was loosing oolant and overheating. I checked for leaks and found that the water pump was leaking. After replacing the water pump I test drove the car for about 4 miles after it was idling for along time and it ...
1991 Pontiac Firebird Formula 5.0L No Start VIN: 1G2FS23F5M
Car came in with no start condition. Prior to coming to me the starter and computer were replaced. Car cranks good. No fuel injector pulse. Spark and fuel pressure good. Car will run with alternate fuel source (propane). Powers & grounds at computer & Pass Key... Trouble codes: 46 (anti-theft system problem)
1993 Saturn SL2 1.9L Misfire VIN: 1G8ZK5577P
I will try and keep this short and simple. Please read what we know carefully before responding. After an extended period of sitting, either cold or hot (worse after 8 or more hours), cylinders #2 and #4 are dead holes! Adding propane into the air intake, wh...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Skylark Custom 2.3L cooling system VIN: 1G4NV55D5S
hey guys, thanks for all the help. turns out that the heater core is partially stopped up. the customer does not want to go for a heater core at this time so we used a 5/8' hose with a 90 degree to totally bypass the core and that seems to have solved the prob...
1998 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52M4W
thanks to all who replied, never thought to wiggle the wires when checking the waveform with the vantage, brainfade, I've told the customer that the camsensor will have to be replaced, I am waiting for their decision. thanks again Trouble codes: P0341 (camshaft sensor circuit range/performance).
1997 Cadillac Catera 3.0L No Start, Misfire VIN: W06VR52R2V
I received 7 replies to my plea for help and I thank those who helped me to think analytically rather than emotionally. I still don't know why the car would not start; the next day when I went to work the car started and has started since. This makes me questi...
1989 Chevrolet R2500 Suburban Scottsdale 5.7L Poor Idle Quality VIN: 1GNGR26N0K
Ok It is really fixed. After reading the prior posts and possible fixes, I went with the torque converter. The torque converter was disconnected and the idle problem went away. The torque converter was changed and the vehicle put back together. I am happy to...
1990 Chevrolet Cavalier 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GH1JC84T6
Thanks for the replies, got 6. 4 asked about egr being weak & allowing it to flow. 2 others asked about the computer. well we went with the computer (1 because egr checked & tested ok. (2 blocking egr made no difference. after customer had it for 4 days, he ca... Trouble codes: 33 (map voltage high).
1991 Chevrolet Lumina Z34 3.4L 3-4 shift VIN: 2GIWPI4X4M
After reviewing the responses we decided to step back and verify all the testing we had done.It still led us to a possible short.Unfortunately we made a cardinal sin in believing our rebuilder who has been with us for almost 20 years was infallible, ha ha.He i...
1995 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCDT19W6S
thanks for the helpful information guys.however this is not are area of expertese.we checked all the basics,plus fuel trim,o2 mv,converter for proper installation,ho2 wiring.swapped o2 sensors,but had no changes.customer decided to take vehicle to more qualifi... Trouble codes: P0138 (bank 1 sensor h02s).
1995 Chevrolet Lumina LS 3.1L dash lights and parking lights VIN: 2G1WN52M0S
Thanks for all the help. I went back to the basics and checked the fuses again. One fuse in the fuse block under the hood had no life witht the key on or engine running. I pulled the fuse out and one of the prongs stayed in the fuse block. the fuse was corrode...
1996 Chevrolet Monte Carlo Z34 3.4L MIL Lamp on VIN: 2G1WX12X0T
Thank you for all the advice: 5 suggested cam timing. It seems these are notorious for skipping a tooth on the exhaust cam on the back head. One person even said that GM has updated these cam pulleys. Fortunately, the cams were perfect. 3 suggested injector pr... Trouble codes: P0172 (Engine rich Block learn at -20).
1997 Chevrolet C2500 Cheyenne 5.7L Hesitation, Cuts out VIN: 1GCGC29R3V
Volume,Volume...As Most replies stated there have been fuel volume problems in this situation. Pressure was good, Actually the same as the new pump, but volume was not there. I replaced pump with 'Delco' pump, screen and fuel filter and it ran like new...Hope ...
2001 Chevrolet Cavalier Z24 2.4L Poor Idle Quality VIN: 1G1JF12T91
Ckd all powers and grounds. Everything ckd out ok. Reprogrammed the PCM again and car ran good for 3 days. Then the problem redeveloped. Seems like the PCM would not hold its program. Sent the car to the dealer for PCM replacement covered under warranty. Custo... Trouble codes: P0122.
2001 Chevrolet Tahoe 5.3L abs motor VIN: 1GNEC13T61
The customer still hasn't decided to replace the ebcm. They are upset that if they buy a new part it will only work after it is sent back to the dealer for programing.
1996 Oldsmobile Aurora 4.0L Hesitation, MIL Lamp on VIN: 1G3GR62C9T
Well I'm sorry to say we didn't have much luck with this one-it quit doing it after we added fuel-the other factor is the temp warmed up this last week-anyway it didn't do it for a week-we gave it back to the owner-Deke Trouble codes: P0101 (maf sensor out of range).
1994 Saturn SL1 1.9L reverse VIN: 1G8ZH5596R
Thanks to all who responded. Most said to do what I had already done, replace valve body with kit from dealer. Others said trans will need to come apart. Luckily the fix was simple and I feel like a moron. When I removed the end cover, I tightened the output s...
1997 Saturn SC1 1.9L MIL Lamp on
customer brought back to the dealer who replaced catalytic converter under the 8 year 80,000 mile warranty. Trouble codes: P0140 (No activity bank 1 sensor 2).
2000 Saturn LS2 3.0L Surge, Cuts out, MIL Lamp on VIN: 1G8JW52R8Y
The problem turned out to be the Mass air flow sensor. I was able to dissasemble and when looking at the sensor pickup fin,you could see somthing that looked like dust around it. A Q-tip was too big to get down in it to clean. since it was my sons car, I decid... Trouble codes: P0300.
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